PCF ProSe Discovery Identifier Update Control
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Solution Overview
Problem
In 4G and 5G ProSe systems, the Policy Control Function (PCF) continues to update ProSe Discovery Identifiers (PDUIDs) even when wireless devices do not need them for restricted ProSe direct discovery, leading to resource wastage and inefficiency.
Innovation Solution
Implementing a mechanism where the PCF receives indications via control plane signaling to determine whether to update or refrain from updating the PDUID, allowing wireless devices to request updates only when necessary, and associating PDUIDs with timers for automatic renewal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PCF continues to update PDUIDs periodically, then the ProSe discovery functionality remains available, but network resources are wasted when devices do not need restricted ProSe direct discovery
Solution Approach 1:
The system dynamically adjusts the PDUID update behavior based on real-time device needs. The PCF receives indications from wireless devices about whether they require restricted ProSe direct discovery and adapts its update frequency accordingly, transitioning from static periodic updates to dynamic on-demand updates.
Solution Approach 2:
The system changes the update parameter from fixed periodic intervals to variable intervals determined by device indication. When a device indicates it does not need restricted ProSe direct discovery, the update parameter effectively becomes infinite (no updates), whereas when needed, updates occur at appropriate intervals.
2Loss of energy
If the PCF updates PDUIDs on demand based from wireless device indications, then network resource efficiency is improved, but the system complexity increases due to additional signaling mechanisms
Solution Approach 1:
The indication mechanism is designed to serve multiple purposes within the existing ProSe framework. The same signaling path and message structures are used for both requesting PDUID updates and for general ProSe discovery coordination, allowing one mechanism to fulfill multiple functions without requiring separate dedicated signaling channels.
Solution Approach 2:
The PCF acts as an intermediary that processes device indications and manages the update logic. Rather than devices directly managing their own PDUIDs or the network continuously monitoring device needs, the PCF mediates between device requests and network resource allocation, simplifying the overall system architecture.
3Loss of energy
If the PCF refrains from updating PDUIDs when not needed, then resource efficiency is improved, but the response time to restore ProSe discovery capability increases when devices need it
Solution Approach 1:
Wireless devices perform preliminary assessment of their ProSe discovery needs and send indications to the PCF before actual discovery operations are required. This allows the network to pre-prepare or maintain PDUIDs in advance, ensuring immediate availability when needed while avoiding unnecessary updates during periods of non-use.
Solution Approach 2:
The system implements a feedback loop where wireless devices continuously inform the PCF about their ProSe discovery requirements. This real-time feedback enables the PCF to adjust its PDUID update behavior dynamically, ensuring updates occur precisely when needed and not before, optimizing both resource efficiency and response time.
Data Source
AI summary
A method, system and apparatus are disclosed. A core network node is provided. The core network node includes processing circuitry configured to receive an indication, via control plane signaling, associated with the wireless device where the indication indicates whether to update a ProSe discovery identifier associated with the wireless device, one of update and refrain from updating the ProSe discovery identifier based at least on the received indication, and transmit the updated ProSe discovery identifier if the ProSe discovery identifier was updated.